Multiple Choice Questions on Javascript with Answers

Questions

1 The ‘$’ present in the RegExp object is called a ____________

A character

B matcher

C metacharacter

D metadata

View Answer

Answer: metacharacter

2 Consider the following JavaScript statement containing regular expressions and check if the pattern matches?

var text = "testing: 1, 2, 3"; 
var pattern = /\d+/g;

A text==pattern

B text.equals(pattern)

C text.test(pattern)

D pattern.test(text)

View Answer

Answer: pattern.test(text)

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3 The regular expression to match any one character not between the brackets is __________

A […]

B [^]

C [^…]

D [\D]

View Answer

Answer: [^…]

4 What does /[^(]* regular expression indicate?

A Match one or more characters that are not open parenthesis

B Match zero or more characters that are open parenthesis

C Match zero or more characters that are not open parenthesis

D Match one or more characters that are open parenthesis

View Answer

Answer: Match zero or more characters that are not open parenthesis

5 What will be the result when non greedy repetition is used on the pattern /a+?b/?

A Matches the letter b preceded by the fewest number of a’s possible

B Matches the letter b preceded by any number of a

C Matches letter a preceded by letter b, in the stack order

D Matches letter a present in the string

View Answer

Answer: Matches the letter b preceded by the fewest number of a’s possible

6 What does the subexpression /java(script)?/ result in?

A It matches “java” followed by the optional “script”

B It matches “java” followed by any number of “script”

C It matches “java” followed by a minimum of one “script”

D It matches “java” followed by a single “script”

View Answer

Answer: It matches “java” followed by the optional “script”

7 What is the most essential purpose of parentheses in regular expressions?

A Define pattern matching techniques

B Define subpatterns within the complete pattern

C Define portion of strings in the regular expression

D matching the complete string

View Answer

Answer: Define subpatterns within the complete pattern

8 The method that performs the search-and-replace operation to strings for pattern matching is _______

A searchandreplace()

B add()

C edit()

D replace()

View Answer

Answer: replace()

9 What would be the result of the following statement in JavaScript using regular expression methods?

A Returns [“123″”456″”789”]

B Returns [“123″,”456″,”789”]

C Returns [1,2,3,4,5,6,7,8,9]

D Throws an exception

View Answer

Answer: Returns [“123″,”456″,”789”]

10 What will be the purpose of exec() in the following JavaScript code?

var pattern = /Java/g;
    var text = "JavaScript is more fun than Java!";
    var result;
    while ((result = pattern.exec(text)) != null) 
    {
        alert("Matched '" + result[0] + "'" +" at position " + result.index +"; 
              next search begins at " + pattern.lastIndex);
    }

A Returns the same kind of array whether or not the regular expression has the global g flag

B Returns different arrays in the different turns of iterations

C Return a sub part of the array

D Returns a null value

View Answer

Answer: Returns the same kind of array whether or not the regular expression has the global g flag

11 What will be the output of the following JavaScript code?

System.out.println(Pattern.matches("[amn]", "abcd"));

A true

B false

C undefined

D a

View Answer

Answer: false

12 What will be the output of the following JavaScript code?

System.out.println(Pattern.matches("[amn]?", "a"));

A true

B false

C undefined

D bcd

View Answer

Answer: true

13 What will be the output of the following JavaScript code?

System.out.println(Pattern.matches("\\d", "1"));

A true

B false

C undefined

D 1

View Answer

Answer: true

14 What will be the output of the following JavaScript code?

 System.out.println(Pattern.matches("[adf]+", "a"));

A true

B false

C undefined

D 0

View Answer

Answer: true

15 What will be the output of the following JavaScript code?

 System.out.println(Pattern.matches("[^abc]", "aemngq"));

A true

B false

C undefined

D 1

View Answer

Answer: false

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